Blog

Four Years of Momentum: Craig Newmark Philanthropies and the Future of Memory Safety

Continued support will advance ISRG's mission.

On the Importance of "Hello" and "Thanks"

Our experience at FOSDEM 2026.

6-day and IP Address Certificates are Generally Available

Short certificates are good for security and now available to all Let's Encrypt subscribers.

A Note from our Executive Director

A year of growth and progress.

Zero Knowledge Proofs from Credentials

Developing solutions for security and privacy in digital identities

10 Years of Let's Encrypt Certificates

Let's Encrypt has been issuing trusted certificates for a decade.

Decreasing Certificate Lifetimes to 45 Days

Improving security for active and revoked certificates.

Ten Years of Community Support

In its first decade, the Let's Encrypt Community Forum has helped tens of thousands of users, kept Let's Encrypt staff in touch with the community, and spurred new tools and projects.

Detecting Privacy Harms in Digital Identity using Divvi Up

Proving your identity to online services can open the door to deanonymization and other privacy risks, but privacy enhancing technologies like Divvi Up can help detect and mitigate such harms in cases where preventing them is impossible or difficult.

Researching the Human Digital Identity Space

Today we are announcing an effort that will allow ISRG to learn about systems for human digital identity.

Ten Years of Let's Encrypt: Announcing support from Jeff Atwood

Seeking to inspire our community of supporters, Jeff Atwood commits $1M to support Let's Encrypt.

How Prossimo's Risk and Opportunity Criteria Help Us Plan

Identifying memory safety work that is both high impact and efficiently achievable.

We Issued Our First Six Day Cert

Hitting a milestone on our path toward optional shorter-lived certs.

Encryption for Everybody

Celebrating ten years of Let's Encrypt.

A Note from our Executive Director

Reflecting on a decade of growth, innovation, and impact at ISRG.

Ending OCSP Support in 2025

Certificate revocation information will be provided exclusively through CRLs.

Intent to End OCSP Service

Moving to a more privacy-respecting and efficient method of checking certificate revocation.

Kristin Berdan joins ISRG as new General Counsel

Join us in welcoming Kristin Berdan to the ISRG team as our new General Counsel.

White House, Craig Newmark Support Memory Safe Software

Growing attention on the solvability of memory safety.

Our first FOSDEM

FOSDEM lets an often overlooked part of tech and software shine: the people behind it.

Public benefit Internet infrastructure is not a “one-and-done” project

ISRG’s Board Chair reflects on our financial support.

A Year-End Letter from our Vice President

A summary of how ISRG’s three projects, Let’s Encrypt, Divvi Up, and Prossimo continue to improve security and privacy.

Tectonics 2023: a Productive Convening to Accelerate Memory Safety

Our first memory safety event generated enthusiasm, ideas, and action toward a more memory safe future.

10 Years of Building a Better Internet

ISRG Board Chair Christine Runnegar reflects on the significance of our work and impact as we celebrate our 10th anniversary.

Prossimo announces Tectonics: an event to shift the work of memory safety forward

The event will be November 2, in San Francisco.

$1.5M from Sovereign Tech Fund to Fuel Memory Safety

Funding supports memory safety in TLS, DNS, and video/image decoding.

ISRG’s 10th Anniversary

As ISRG celebrates its 10th anniversary, Co-founder and Executive Director Josh Aas reflects on the accomplishments of the nonprofit and looks ahead to its continued impact in the years to come.

AWS commits $1M to Prossimo, bringing memory safety to critical parts of the Web

AWS commits $1M to advance four Prossimo initiatives, improving memory safety for TLS, NTP, media codec, and permissions boundaries.

Divvi Up Receives Funding from Internet Society Foundation and Meta

Support for ISRG’s newest project, Divvi Up, a service for privacy-preserving metrics

ISRG Receives $100k Grant from Craig Newmark Philanthropies

This grant will support ISRG and its three projects.

ISRG Joins the Linux Foundation as an Associate Member

Showing our support for Open Source and open collaboration.

A Look into the Engineering Culture at ISRG

ISRG has implemented several practices that aim to create a workplace where engineers can thrive.

A Year-End Letter from our Executive Director

It's been an exciting year for ISRG and its projects: from Let's Encrypt issuing its three billionth certificate to Prossimo supporting the efforts to get Rust into the Linux kernel.

Remembering Peter Eckersley

Peter Eckersley, a Let’s Encrypt co-founder, passed away unexpectedly on September 2, 2022.

Christine Runnegar is Elected to Chair ISRG’s Board of Directors

Join us in congratulating Christine Runnegar as our new Board Chair!

A Profile of Richard Barnes, ISRG Director

As a longstanding member of ISRG’s Board of Directors, Richard Barnes shares his thoughts on our organization’s growth and change.

Let’s Encrypt Receives the Levchin Prize for Real-World Cryptography

We are honored to be recognized for the impact on the field of cryptography.

New Major Funding from the Ford Foundation

$1M grant from The Ford Foundation supports ISRG’s security and privacy mission.

Introducing Sarah Heil, ISRG’s CFO

Sarah Heil has joined Internet Security Research Group as Chief Financial Officer.

A Year-End Letter from our Executive Director

A summary of the progress made toward improving security and privacy with ISRG’s three projects: Let’s Encrypt serves 260M websites, our Prossimo project seeks to solve problems caused by lack of memory safety, and Divvi Up is building a privacy-preserving metrics system.

Project Update and New Name for ISRG Prio Services: Introducing Divvi Up

ISRG is developing a privacy-preserving metrics protocol and service based on Prio and Heavy-Hitters. The project is called Divvi Up.

ISRG Prio Services for Preserving Privacy in COVID-19 EN Apps

ISRG serves as one of the data processors in the Prio-based privacy-preserving metrics system used by Apple and Google’s Exposure Notifications Express (ENX) system.

Preparing Rustls for Wider Adoption

It’s time for the Internet to move on to more secure software, and that’s why our Memory Safety Initiative is coordinating work to make further improvements to the Rustls TLS library.

Introducing Our Newest Board Member: David Nalley

We are pleased to announce that David Nalley, Principal of Open Source Strategy and Marketing at AWS, has joined the ISRG Board of Directors.

Introducing Erica Portnoy to the ISRG Board of Directors

We are pleased to welcome Erica Portnoy, Senior Staff Technologist at EFF, to the ISRG Board of Directors!

A Memory Safe TLS Module for the Apache HTTP Server

The Apache HTTP Server, httpd, is an important piece of the Internet’s infrastructure. Hundreds of millions of websites use it every day to serve requests. As such, improvements to httpd security have broad impact.

Introducing ISRG Prio Services for Privacy Respecting Metrics

Today we are announcing a new project for ISRG: operation of Prio Services infrastructure. Prio Services will be a second project joining Let’s Encrypt under the ISRG umbrella.

Memory Safe ‘curl’ for a More Secure Internet

Memory safety vulnerabilities represent one of the biggest threats to Internet security. As such, we at ISRG are interested in finding ways to make the most heavily relied-upon software on the Internet memory safe.

Welcoming Vicky Chin to the ISRG Board of Directors

We are pleased to welcome Vicky Chin, Director of Desktop Product Development at Mozilla, to the ISRG Board of Directors!

Meet Radiant Award Recipient Claudio Jeker

We’re excited to announce the third Radiant Award recipient, Claudio Jeker.

Meet Radiant Award Recipient Rachel Player

We’re excited to announce the second Radiant Award recipient, Rachel Player.

Max Hunter Joins ISRG Board of Directors

Max Hunter, of Electronic Frontier Foundation (EFF), brings a wealth of technology and privacy experience as the newest member of the ISRG Board of Directors.

Welcoming Christine Runnegar to the ISRG Board of Directors

We are happy to announce that Christine Runnegar, Senior Director of Internet Trust at Internet Society, joined the ISRG Board of Directors in late 2018.

Meet Radiant Award Recipient Jason Donenfeld

We’re excited to announce the first Radiant Award recipient, Jason Donenfeld.

Welcoming Aanchal Gupta to the ISRG Board of Directors

We are delighted to announce our newest board member: Aanchal Gupta, Director of Security at Facebook.

ISRG: A Home for Public Benefit Digital Infrastructure

Welcome to the new website for Internet Security Research Group (ISRG).